Filter.



c. SELLENSGHEIDT.

FILTER. l APPLICATION FILED DEO. V24, 1907.

947,856. Patented Feb. 1,1915.

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CARL SELLENSCHEIDT, OF BERLIN, GERMANY.

Specification of Letters Patent.

FILTER. Y

Patented Feb 1, 1910;

Application ,mea December 24, 1907. serial Ne. 407,941. Y.

To all 'whomit may concern.:

, Be it known that I, CARL SnLnnNsCHnm'r, citizen of Germany, residingat Berlin, Germany, have invented new andl useful Improveineiits inFilters, of which 'the follow` infr a specification.

In filters. of various kinds for treating licor and other liquidsexperiments have been iiiade with india-rubber for the frame of thefiller plates, with a view to preventing the liquid from comi-iig iiicontact with metal whereby its taste and keeping-quality, etc., aredetrimentally affected.

According to inyinventioii I employ rub'- bcr not only for the actualframe, but also for the parts located within the latter and which .serveto support adjacent filteringlayers or to receive the filtering-cloths,etc. In this ,manner the liquid only comes 1n contact with the neutralindia-rubber. In`

stead of rubber, paper or papery material or otherncutral subst-ancecapable of Vbeing pressed may be used." Y

The rubber or like filter late is preferably furnished with'a metal disor plate extending over tlie entire area of the inner part,

' for the purpose of stiffening it. Such disk may be perforated .inorder to increase the elasticity of 4tliewliole structure and toconstitnte a connection between the two layers of material on each sideof the disk.'

One form of coiistructionof the new device is illustrated in theaccompanying drawri'gure 1 is a plan of the filter plate, a fragment ofthe surface of the inner member being removed todisplay the underlyingmetzil disk. Fig. 2 isy an enlarged section' e through a portion of theplate, taken paral- Iel to the `r1bs. Fig. 3 is an enlarged section'thl'ongh the saine, taken transversely of the r1 s.

Externally the filtering-body or platev resents the form of a soca'lledgrid of a fi ter- 'press It consists essentiallyof a frame. a,

and an interior part, b, furnished with ribs, b'. This plateconsists'entirely lof rubber orY equivalent material, except' that inthe' interior there is located ametal disk c of uniform tliicknessandhaving substantially the wiole area of the said inner ortion. Thisdisk,c, is perforated, the cylindrical flat o posite surfaces which extendover or ystud-shapedv pieces of material which force thein se vesthrough the holes c1 con stituting a connection between the layerseofmaterial on each side. The two `op osite layers ofY the 'compressiblematerial, thusjjoined and held to the faces of the disk,

are preferably united `together around the one side to the other, whichhas theuadvantage in filter presses that the particles of` l the massare less liable to be carried along.

The liquid ldistributes itself and collects in the annular channel a1,into which the grooves between the ribs b1 conduct,

As .it is desired that the pressure of the filter member a ainst thelayer of filtering material, be co ned to thev region of its periphery,the several ribs are made' of less height than theframeportion,throughout.

the central reglion ,of the plate, but are of substantially t esameheight, as shown 'in Fi s. 2and 3, in the nei hborhood ofthe col ectinchannel, at whic points they exert a tig tening effect on the edges ofthe filtering layer.

Having thus described my invention, what I claim as new and desire toVsecure byLetters' Patent of the United States is- 1. A filter memberconsisting of a plate having a surface of a neutralv material to bepresented to the liquid under. treatment and Y formed of an outer frameportion and an inner ribbed portion with a collecting chane neltherebetween, the ribs of said innei' portion being centrally of lessheight than the frame portion but rising to such height as they ap roachthe said collecting channel.

2. A filter member comprising an interior substantially fiat metal plateof uniform` thickness, embedded in and covered by opposite Vlayers of acompressiblematerial of a neutral character, Y the said layers beinYunited around the margin of said disk an forming relatively thickerframe to said vfilter member.. V

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CARL SELLENSCHEIDT.

Witnesses: .Y

WoLimMAn HAUPT, Hans HEIMANN.

eing.

